From: Stefan Bodewig &lt;bodewig(a)apache.org&gt; Subject: [CVE-2012-2098] Apache Commons Compress and Apache Ant denial of service vulnerability Date: May 23, 2012 4:00:48 PM GMT+02:00 To: dev(a)commons.apache.org, user(a)commons.apache.org, dev(a)ant.apache.org, user(a)ant.apache.org, announce(a)apache.org, security(a)apache.org, full-disclosure(a)lists.grok.org.uk, bugtraq(a)securityfocus.com, David Jorm &lt;djorm(a)redhat.com&gt; CVE-2012-2098: Apache Commons Compress and Apache Ant denial of service vulnerability Severity: Low Vendor: The Apache Software Foundation Versions Affected: Apache Commons Compress 1.0 to 1.4 Apache Ant 1.5 to 1.8.3 Description: The bzip2 compressing streams in Apache Commons Compress and Apache Ant internally use sorting algorithms with unacceptable worst-case performance on very repetitive inputs. A specially crafted input to Compress' BZip2CompressorOutputStream or Ant's <bzip2> task can be used to make the process spend a very long time while using up all available processing time effectively leading to a denial of service. Mitigation: Commons Compress users should upgrade to 1.4.1 Ant users should upgrade to 1.8.4 Credit: This issue was discovered by David Jorm of the Red Hat Security Response Team. References: http://commons.apache.org/compress/security.html http://ant.apache.org/security.html Stefan Bodewig